As is my practice, when no response is received I post my correspondence publicly so my efforts to find out useful information are publicly
documented. Sometimes it comes to light that my email went astray
and a response is forthcoming, as it did with the ACNC. Sometimes people just insult my intelligence.

On a brighter note, I did get a useful response to my query to the Charles Koch Institute about which organisations they recruit for.
Turns out The Atlas Network is on that list.